Comments

From: Ian Munsie <imunsie@au1.ibm.com>
This patch actually hooks up doorbell interrupts on POWER8:
- Select the PPC_DOORBELL Kconfig option from PPC_PSERIES
- Add the doorbell CPU feature bit to POWER8
- We define a new pSeries_cause_ipi_mux() function that issues a
doorbell interrupt if the recipient is another thread within the same
core as the sender. If the recipient is in a different core it falls
back to using XICS to deliver the IPI as before.
- During pSeries_smp_probe() at boot, we check if doorbell interrupts
are supported. If they are we set the cause_ipi function pointer to
the above mentioned function, otherwise we leave it as whichever XICS
cause_ipi function was determined by xics_smp_probe().
Signed-off-by: Ian Munsie <imunsie@au1.ibm.com>Tested-by: Michael Neuling <mikey@neuling.org>
---
arch/powerpc/include/asm/cputable.h | 3 ++-
arch/powerpc/platforms/pseries/Kconfig | 1 +
arch/powerpc/platforms/pseries/smp.c | 33 ++++++++++++++++++++++++++++++--
3 files changed, 34 insertions(+), 3 deletions(-)